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Garmin GPS Interface HELP — Parallax Forums

Garmin GPS Interface HELP

autobus83autobus83 Posts: 6
edited 2008-02-10 01:40 in Propeller 1
I am just getting into serial data transfer with the basic stamp. I have an Etrex Legend and I have the serial cable. If I have done my home work right then pin 3 on the GPS is data out and pin 4 is ground. I am wondering how to wire it to the stamp. Do I put pin 3 to the serin pin and the ground just to the ground on the stamp. Also any other good information on this that anybody has would be greatly appreciated.

Adam

Comments

  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-02-10 01:40
    Adam, do you have a basic stamp or a spin stamp? Before you wire it to anything you need to check what voltage you get out of it. If it is RS232 according to the spec you will get +15 to -15 volts which will not be good for your micro-controller. You should be able to just connect a resistor (10K+) in series with the input and this should get rid of any problems. If you wanted to play it safe you could also include a diode in there to limit the voltage.
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